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  Subjects -> CHEMISTRY (Total: 765 journals)
    - ANALYTICAL CHEMISTRY (45 journals)
    - CHEMISTRY (530 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (40 journals)
    - ORGANIC CHEMISTRY (40 journals)
    - PHYSICAL CHEMISTRY (63 journals)

ANALYTICAL CHEMISTRY (45 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 173)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 7)
Acta Analytica     Hybrid Journal   (Followers: 6)
Advances in Analytical Chemistry     Open Access   (Followers: 17)
American Journal of Analytical Chemistry     Open Access   (Followers: 24)
Analytica Chimica Acta     Hybrid Journal   (Followers: 31)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 24)
Analytical Chemistry     Full-text available via subscription   (Followers: 260)
Analytical Chemistry Insights     Open Access   (Followers: 15)
Analytical Letters     Hybrid Journal   (Followers: 6)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 2)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 4)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 22)
Current Analytical Chemistry     Hybrid Journal   (Followers: 5)
Drug Testing and Analysis     Hybrid Journal   (Followers: 3)
Electroanalysis     Hybrid Journal   (Followers: 3)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 19)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 2)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 4)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 3)
ISRN Analytical Chemistry     Open Access   (Followers: 13)
ISRN Chromatography     Open Access   (Followers: 1)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 4)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 6)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 12)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 2)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 3)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 17)
Main Group Metal Chemistry     Full-text available via subscription  
Microchemical Journal     Hybrid Journal   (Followers: 2)
Phytochemical Analysis     Hybrid Journal   (Followers: 1)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
Surface and Interface Analysis     Hybrid Journal   (Followers: 12)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 17)
Trends in Environmental Analytical Chemistry     Hybrid Journal  
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
Journal Cover Journal of Analytical Chemistry
   [14 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
     Published by Springer-Verlag Homepage  [2209 journals]   [SJR: 0.322]   [H-I: 17]
  • Adsorption activity of carbon nanotubes formed from brown sphagnum moss in
           mechanical activation
    • Abstract: Abstract Carbon nanotubes have been formed as a result of mechanical activation of amorphous carbon obtained after the pyrolytic treatment of brown sphagnum moss. The yield of nanotubes grows from 8 to 75 wt % with increasing the time of mechanical activation from 4 to 27 h. An integrated study of the adsorption properties of carbon materials obtained from sphagnum moss is presented. It is shown that the capability of the oxidative modification of carbon nanotubes depends on the parameters of the formation process, and the efficiency of adsorption capacity is a function of the storage time of the carbon material. The potential of carbon materials obtained from sphagnum moss as enterosorbents is considered.
      PubDate: 2014-05-01
       
  • Sensitive, selective and rapid determination of lafutidine in human plasma
           by solid phase extraction-liquid chromatography-tandem mass spectrometry
    • Abstract: Abstract A simple, sensitive and high throughput liquid chromatography-tandem mass spectrometry method has been developed for the determination of lafutidine in human plasma. Sample clean-up involved solid phase extraction of lafutidine along with ranitidine as the internal standard from 100 μL of human plasma. The chromatographic separation is achieved within 2.5 min on a Grace Denali C18 (50 × 4.6 mm, 5 μ) column using 2 mM ammonium acetate, pH 3.0 adjusted with acetic acid and acetonitrile (20: 80, v/v) as the mobile phase. The precursor → product ion transitions for lafutidine (m/z 432.2 → 351.4) and IS (m/z 315.3 → 176.3) were monitored on a triple quadrupole mass spectrometer, operating in the multiple reaction monitoring and positive ion mode. The method is validated over a wide dynamic concentration range of 0.25–1000 ng/mL. The mean relative recovery for lafutidine across quality controls is 97.9%. The relative matrix effect between eight different plasma lots, expressed as coefficient of variation of the slopes of the calibration lines is 1.94. The method is applied to a bioequivalence study of 10 mg lafutidine tablet formulation in 26 healthy Indian male subjects under fasting condition. The reproducibility of study data is demonstrated by analysis of 93 incurred samples.
      PubDate: 2014-05-01
       
  • Spectrofluorimetric method for the determination of uric acid in human
           serum
    • Abstract: Abstract A new spectrofluorimetric method is described for the determination of uric acid (UA), that can remarkably reduce the fluorescence intensity of the enoxacin (ENX)-terbium ion (Tb3+) complex at 545 nm. The reduced fluorescence intensity of Tb3+ ion at pH 5.7 is proportional to the concentration of UA. Optimum conditions for the determination of UA have been investigated. The linear range and detection limit for the determination of UA are 6.0 × 10−7–3.0 × 10−5 M and 1 × 10−7 M, respectively. The relative standard deviation (RSD) was 0.4% for 6 × 10−6 M UA (n = 11). The method is simple, practical and relatively free of interferences. It has been successfully applied to assess UA in serum at the level of 3 × 10−4 M with an RSD of 5–7% (n = 3). The results were evaluated by comparison with a common clinical spectrophotometric method using phosphotungstic acid as developer.
      PubDate: 2014-05-01
       
  • Determination of nickel using cold-induced aggregation microextraction
           based on ionic liquid followed by flame atomic absorption spectrometry
    • Abstract: Abstract Cold-induced aggregation microextraction (CIAME) combined with flame atomic absorption spectrometry (FAAS) was applied to preconcentration and determination of nickel(II) ions in natural water samples. The proposed method used 1-hexyl-3-methylimidazolium hexafluorophosphate ([Hmim][PF 6 ]) as the extraction solvent and 1-(2-thiazolylazo)-2-naphthol (TAN) as the complexing agent. The extraction solvent was dissolved in the sample solution at 45°C. After dissolving, the solution was cooled in the ice bath and a cloudy solution of IL fine droplets was formed due to the decrease of IL solubility. After centrifugation, the fine droplets of extractant phase were settled at the bottom of the conical-bottom centrifuge tube. Analysis was carried out by a FAAS. Several important parameters influencing the CIAME extraction efficiency such as pH, complexing agent concentration, extraction solvent volume, salt effect, solution temperature, extraction time, centrifugation time and heating time were investigated and optimized. Under the optimum conditions, the limit of detection (LOD) was 0.8 ng/mL, and the relative standard deviation (RSD) was 3.4% for 50 ng/mL of nickel. The performance of the method was evaluated for extraction and determination of nickel in tap, mineral and seawater samples, and satisfactory results were obtained.
      PubDate: 2014-05-01
       
  • Determination of trace amount of IO       stack"> 3        class="a-plus-plus">− with KIO       class="a-plus-plus">3-KBr-(DBS-arsenazo) system by
           spectrophotometry
    • Abstract: Abstract In the medium of 0.45 M nitric acid IO 3 − oxidizes KBr to produce Br2, which oxidizes DBS-arsenazo (DBS-ASA) to decolour. Based on this principle, a new method for the determination of iodate has been developed. The KIO3-KBr-(DBS-ASA) system presents a maximum absorption at 530 nm. At that wavelength, Beer’s law is obeyed over the range of 0.050–0.60 μg/mL of IO 3 − presenting a linear relationship. The apparent molar absorptivity is 1.75 × 105 L/mol cm and the detection limit is 0.048 μg/mL. This method has been successfully applied to the determination of IO 3 − content in the iodized table salt sample with good results.
      PubDate: 2014-05-01
       
  • Control of the composition of lanthanum gallium silicate by laser ablation
           inductively coupled plasma mass spectrometry
    • Abstract: Abstract The possibilities of determining the impurities and basic components of lanthanum gallium silicate using laser ablation in combination with inductively coupled plasma mass spectrometry (LA-ICP-MS) were shown. A procedure for the determination of 54 impurity elements with the limits of determination from n × 10−5 wt % for Mg, Ti, V, Cr, Mn, Ni, Cu, and Zn to 2 × 10−7 wt % for U and also a procedure for the determination of a ratio between basic components were developed. It was found that the concentration ratios between gallium and lanthanum and silicon and lanthanum in the crystals of lanthanum gallium silicate remained constant upon consecutive melting operations with the addition of a charge mixture to the crucible.
      PubDate: 2014-05-01
       
  • Determination of total iodine in samples with an organic matrix by
           solid-phase spectrophotometry
    • Abstract: Abstract A solid-phase spectrophotometry method is proposed for determining total iodine in samples with an organic matrix. The method involves the sorption of I2 formed in oxidation of iodide with oxone (active ingredient potassium peroxomonosulfate) by polyurethane foams, followed by the registration of the adsorbent absorbance at 360 nm. Sample preparation includes treatment with an aqueous methanolic solution of tetramethylammonium hydroxide followed by thermostation at 90 ± 2°C for 3 h. The detection limit for iodine calculated using the 3s-test is 0.03 μg in a sample aliquot portion of ≤8 cm3. The relative standard deviation is 8–12% for iodine concentration in the range 0.3–5.0 μg/g.
      PubDate: 2014-05-01
       
  • Estimation of the state of biological samples by the composition of the
           headspace using a multisensor system
    • Abstract: Abstract The use of identification parameters of piezoelectric sensor array A ij max for estimating the state and differentiation of the type of infectious agent by virtue of marker gases in the headspace over biological samples is discussed. A regression model for the screening diagnosis of the presence of infectious agents is developed.
      PubDate: 2014-05-01
       
  • Extraction-spectrophotometric determination of selenium in organoselenium
           compounds using aromatic o-diamines
           
    • Abstract: Abstract Procedures for the extraction-spectrophotometric determination of selenium in organoselenium compounds using a new reagent, 1,2-diamino-3,4,5,6-tetrafluorobenzene (DAFB), and a known reagent, 2,3-diaminonaphthalene (DAN), are developed. Complexes of DAFB or DAN with selenium(IV) are extracted with toluene, and the absorbance of the extracts is measured. The optimal conditions for the determination were found, and the spectrophotometric characteristics were determined. The calibration curves are linear in the range of selenium concentrations of 1–10.6 mg/L (DAFB) and 1–9.1 mg/L (DAN). Nitrogen, chlorine, bromine, fluorine, and sulfur present in organoselenium compounds do not interfere with the determination of selenium. The relative error of determination does not exceed ±2%.
      PubDate: 2014-05-01
       
  • QuEChERS coupled to dispersive liquid-liquid microextraction for the
           determination of aflatoxins B1 and M1 in dairy foods by HPLC
    • Abstract: Abstracts A rapid method is proposed for determining aflatoxins B1 and M1 in milk and dairy products by HPLC with fluorimetric detection. To extract aflatoxins from samples and purify the extracts of impurities the QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method was used. The purified extracts were preconcentrated by dispersive liquid-liquid microextraction. The detection limits for aflatoxins B1 and M1 are 0.1 and 0.01 μg/kg, respectively. The relative standard deviation of the results of analysis is no more than 6%. The duration of analysis is 1–1.5 h.
      PubDate: 2014-05-01
       
  • Sorption-spectrometric determination of palladium and gold using silica
           chemically modified with dipropyl disulfide groups
    • Abstract: Abstract It has been found that silica chemically modified with dipropyl disulfide groups (DPDSS) quantitatively extracts palladium(II) from solutions in the acidity range from 4 M HCl to pH 4 and gold(III) in the range from 1 M HCl to pH 2 with a partition coefficient at the level of n × 104 cm3/g. The adsorption of palladium(II) and gold(III) at room temperature is highly selective, whereas non-ferrous and other platinum metals are not adsorbed. Sorption-atomic absorption, sorption-ICP-atomic emission, and sorption-photometric methods for the determination of palladium and gold have been developed using DPDSS. The accuracy of the methods was tested by the analysis of certified reference samples.
      PubDate: 2014-05-01
       
  • Determination of metal ions in water and tea samples by flame-AAS after
           preconcentration using sorghum in nature form and chemically activated
    • Abstract: Abstract Sorghum-agricultural waste in nature (SAWN) and chemically activated with phosphoric acid (SAWAC) was used as a solid phase extraction material for determination of cadmium, copper, manganese and lead ions in aqueous solutions by flame atomic absorption spectrometry (FAAS). The effect of pH, sample flow rate and volume, eluent type, volume and flow rate, and the effects of potentially interfering ions on the recovery of the analytes were investigated. Adsorption capacity of SAWN and SAWAC was determined by batch method under the optimized conditions. Adsorption capacity of SAWAC was found to be 9.53, 11.77, 11.64, and 15.01 mg/L for Cd, Cu, and Mn and Pb ions, respectively. The limit of detection (LOD) for the analytes was found in the range of 0.16–1.21 μg/L with a theoretical preconcentration factor of 50. The method was validated by analyzing certified material (GBW 07605-Tea) and the results were in a good agreement with the certified value. In addition, the proposed method was applied to the determination of analytes in tea and river water samples.
      PubDate: 2014-05-01
       
  • Determination of fluoride ions in urinary stones by ion chromatography
    • Abstract: Abstract A method of the ion chromatographic determination of fluoride ions in urinary stones has been developed. Sample preparation of solid mineral-organic samples includes dissolution in concentrated hydrochloric acid, dilution with deionized water, and the elimination of excess calcium and magnesium cations by adding a KU-2 sulfo cation exchanger in the H-form to samples and filtration through a membrane filter. Anions were separated on a Shim-pack IC-AIS anion-exchange column (100 × 4.6 mm) with elution with a mixture of 2.0 mM phthalic acid and 1.2 mM sodium hydroxide (pH 3.5). The linearity range of the fluoride ions in the obtained solutions of urinary stones with conductometric detection was 0.01–300 mg/L, the limit of detection calculated by the 3s-test was 0.004 mg/L. The quantitative determination of fluoride ions in 20 samples of urinary stones was performed; in 80% of cases the presence of fluorides in the stones at a level from 0.01 to 4 mg/g of the stone was detected. The average concentration of the fluoride ions was 0.3 mg/g of stone. For 20% of the samples an elevated concentration of fluoride ions compared to the average one was found.
      PubDate: 2014-05-01
       
  • A simple and rapid LC-MS/MS method for the determination of Enalapril in
           human plasma for pharmacokinetic and bioequivalence studies in korean
           healthy volunteers under fasting conditions
    • Abstract: Abstract A simple and rapid liquid chromatography-tandem mass spectrometry method for Enalapril in human plasma was developed and applied to pharmacokinetic and bioequivalence test for 2 formulations of Enalapril (10 mg) capsules in healthy korean volunteers under fasting state. The analytes were extracted from plasma by simple protein precipitation by acetonitrile, separated on YMC C8 column using methanol-10 mM ammonium formate (80: 20, v/v) as the mobile phase, and detected by tandem mass spectrometry with Turbo IonSpray interface operating in the positive ion mode for Enalapril and Glibenclamide (IS) in MRM mode. The ionization was optimized using electro-spray ionization (ESI) (+) and selectivity was achieved by MS/MS analysis, m/z 376.447 → 234.1 for Enalapril and m/z 494.1 → 369.1 for IS. The assay exhibited good linearity in the concentration ranges of 1.0 ∼ 300 ng/mL for Enalapril in human plasma with lower limit of quantification (LLOQ) of 1.0 ng/mL. The chromatographic run time was approximately 2.0 min. No endogenous compounds were found to interfere with the analysis. The accuracy and precision were acceptable for concentrations over the standard ranges. The method was successfully applied to pharmacokinetic (PK) and bioequivalence (BE) studies by determination of Enalapril in the blood sample taken up to 12 h after oral administration of two Enalapril (10 mg) formulations and results from PK analysis suggested that the 2 types of 10 mg Enalapril tablets should be considered to be bioequivalent for both the extent and rate of absorption in normal volunteers.
      PubDate: 2014-05-01
       
  • Determination of cetirizine and its impurities in bulk and tablet
           formulation using a validated capillary zone electrophoretic method
    • Abstract: Abstract A stability indicating capillary electrophoretic method for separation and determination of cetirizine dihydrochloride and its major impurities in bulk and a tablet dosage form was developed. The electrophoretic separation was performed in an uncoated fused-silica capillary (75 cm × 50 μm i.d.) using 75 mM sodium phosphate (pH 2.8) as background electrolyte, with an applied voltage of +25 kV at 25°C and UV detection at 230 nm. Fexofenadine was used as internal standard. The proposed method was found selective for determination of the main drug and its major impurities. The regression data obtained from the calibration plots indicated linear relationship (r 2 = 0.998) over the concentration range of 40–240 μg/mL of cetirizine. Repeatability and reproducibility of the method, assessed as intra-day and inter-day variation and expressed as RSD (%), were 1.3 and 2.6, respectively. Stress tests on cetirizine under acidic, basic, oxidative and heat incubating at 80°C conditions revealed that no major compound was formed under the applied conditions and the proposed CE method is applicable for stability studies on cetirizine. Then, the method was successfully applied to the determination of cetirizine in bulk and a tablet dosage form.
      PubDate: 2014-05-01
       
  • Spectrofluorimetric study and determination of desipramine in the presence
           of β-cyclodextrin
    • Abstract: Abstract The native fluorescence intensity of desipramine was enhanced in the presence of β-cyclodextrin in aqueous solution. The inclusion complex formation between these compounds was studied by spectrofluorimetry. A stable complex with a 2: 1 stoichiometry of β-cyclodextrin to desipramine was formed (logβ2 = 9.29 ± 0.01). In the presence of an optimum concentration of β-cyclodextrin, the fluorescence intensity was linearly proportional to desipramine concentration in the range of 0.1–100 μg/mL (7.2 × 10−7−1.0 × 10−4 M) with a limit of detection of 7 × 10−8 M. The method was successfully applied to the detection of desipramine in its tablets.
      PubDate: 2014-04-01
       
  • Composite adsorbents based on inorganic salts for the rapid
           preconcentration of low-molecular polar organic compounds from humid air
           followed by gas chromatographic determination
    • Abstract: Abstract The regularities of the retention of organic vapors on composite adsorbents based on inorganic salts are determined. It is found out that such adsorbents possess very high adsorption capacity relative to low-molecular polar organic compounds and can be used for their adsorption preconcentration from an air flow, followed by thermal desorption and gas-chromatographic determination. To reduce the detection limits of analytes in humid air, a two-column system of adsorption preconcentration is proposed, involving passage of an air sample through two columns connected in a series, one with a KF-based desiccant and another with a Mg(ClO4)2-based adsorbent.
      PubDate: 2014-04-01
       
  • Determination of valacyclovir hydrochloride in tablets and spiked plasma
           samples by spectrofluorimetry
    • Abstract: Abstarct A novel, simple and rapid stability-indicating spectrofluorimetric method has been developed for the determination of valacyclovir hydrochloride in tablets and spiked plasma samples. Method based on the reaction between valacyclovir and fluorescamine in borate buffer solution of pH 9.0 to give highly fluorescent derivatives that were measured at 475 nm using an excitation wavelength of 390 nm. The method has linear relation with fluorescence intensity in the concentration range of 0.25–1.25 μg/mL. The developed spectrofluorimetric method was validated with respect to linearity, precision, sensitivity, accuracy and selectivity. The degradation behavior of the drug was also investigated: the drug solution was subjected to neutral, acid and alkali hydrolysis, oxidation, thermal stress and exposure to the sunlight. The method proved to be selective and useful for the investigation of the stability of valacyclovir. Successful applications of the developed method for the drug determination in tablets and spiked plasma samples were also performed.
      PubDate: 2014-04-01
       
  • Synthesis, characterization and electrochemical behavior of a new
           diimine-dioxime compound and its application in developing
           Hg(II)-selective membrane electrode
    • Abstract: Abstract In this work, a new diimine-dioxime compound (N,N′-bis[1-biphenyl-2-hydroxyimino-2-(4-chloroanilino)-1-ethylidene]-1,4-phenylenediamine) was synthesized and characterized by a combination of elemental analyses, FT-IR, 1H- and 13C-NMR spectra. The extraction ability of the new compound has been examined in chloroform by using several transition metal picrates such as Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pb(II), Cd(II) and Hg(II). It has been observed that diimine-dioxime compound shows a high affinity to Hg(II) ion. The electrochemical measurements of the compound were performed by cyclic voltammetry in acetonitrile solution at room temperature, and two irreversible oxidation waves were observed. A Hg(II)-selective electrode based on the diimine-dioxime compound has been developed. The electrode showed linear responses with Nernstian slopes of 33 ± 1 mV per decade over a wide concentration range (1.0 × 10−2–8.0 × 10−6 M). The limit of detection was 2.4 × 10−6 M. The electrode has a response time about 10–15 s and it did not show a considerable divergence in its potential response over a period of 1 month. The proposed electrode revealed selectivity towards Hg(II) ion in the presence of various cations. The electrode could be used over a wide pH range of 4.0–9.0. The electrode can be successfully used as an indicator electrode for potentiometric titration of Hg(II) with EDTA.
      PubDate: 2014-04-01
       
  • Matrix effect and methods for its elimination in bioanalytical methods
           using chromatography-mass spectrometry
    • Abstract: Abstract The causes of the occurrence of matrix effect in bioanalytical methods using chromatography-mass spectrometry have been discussed. The comparative evaluation of the most frequently used methods for the reduction and elimination of matrix effects by the selection of an internal standard, various versions of sample preparation of biological samples for analysis, and the optimization of chromatographic and mass-spectrometric parameters has been performed. International requirements to the determination of the matrix effect in the validation of bioanalytical methods have been considered.
      PubDate: 2014-04-01
       
 
 
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